Artificer s level



(No Model.)

J. W. HARM'ON.

ARTIFIGER'S LEVEL.

Patented Jan. 23, 1883.

Winewaw.

S T a S Inveno r.

fi'fin/ W ligmow. 3 83 @1459.

N. PETERS. Phmo-umv n her, Wmhinglon. n C.

- resented.

PATENT rrrcn.

JOHN W. HARMON, OF BOSTON, MASSACHUSETTS.

Anrlrlczas LEVEL.

SPECIFICATION forming part of Letters Patent No. 270,951, dated January 23, 1883.

' Application filed January 513, 1882. (N0 model.)

To all whom it may concern:

Be it known that I, JOHN W. HARMON, of Boston, of the county of Suffolk and State of Massachusetts, have invented a new and useful Improvement in Artificers Levels; and I do hereby declare the same to be described in the following specification and represented in the accompanying drawings, of which-- Figure 1 is a side elevation, Fig. 2 a longitudinal secti0n, and Fig. 8 an end view, of the instrument embracing myinvention, which has reference to the leveling-instrument for which Letters Patent No. 234,709, dated November 23, 1880, have been granted to me.

My present invention is defined in the claims hereinafter presented; and it consists mainly in the combination of a-stand provided with a circular flange, divided are, central pivot, centralizing-pointer, and adjustable legs, with a bar having lips and a pivotal screw, and with the spirit-level-carrying bar, arched standard, telescope, and adj nsting-screws, all being substantially as hereinafter described and as rep- The aforesaid bar, pivoted at its middle to the instrument-base, serves, when of1 v the stand, to connect the said base to a wooden or other proper bar and as a medium for the base adjusting screws to work against. It also answers as a slope or batter definer, as by means of it and the smaller spirit-level of the instrument the batter of a wall or chimney may be defined or ascertained; so by means of it and the large spirit-level a slope may be defined or deterniined, all of which will be readily understood by artificers or persons who may have occasion to use the instrument.

My invention further consists in acircular stand provided with a divided are, a pivot-centralizingpointer,and adjustablelegs, combined or for use with such leveling-instrument, or with it and the said base-bar, as hereinafter set forth.

. In the drawings, A denotes the instrumentbase, it being straight on its bottom or lower edge. There projects up from such base an arched standard or level-guard, B, it being formed and arranged as shown. Within the base is a spirit-level, O, the former being troughed or chambered to receive the latter and provided with a cap-plate, E, to cover it. This cap-plate has a slot, at, in it over the level,

to render visible the air-bubble of the latter.

Furthermore. the base is provided with two projections, F F, one of which is adapted to receive another spirit-level, G, which is arranged at a right angle to the level first named, there being in the side of the socketed projection an opening or slot, b, to admit of the airbubble of the level G being seen, as occasion mayrequire. There is pivoted to the standard B at its crown or middle part a socket-piece, H, to receive and support a telescope or sighttubc, I, which extends through the socketpiece, and is held in place therein by means of a clamp-screw, c, screwed into the socket-piece and against the tube. a The said telescope or sight-tube rests upon the milled heads of two adjusting-screws,K K, which are screwed into the projections at the-ends ofthe arched standard, and arranged therein and with relation to the tube and its socket-piece in manner as represented. These screws serve to properly adjustthe telescope or sight-tube with referonce to either of the spirit-levels, and especially to bring it into parallelism with the lower surface of the base, which is to be supposed to be arranged in parallelism with the axis of the spirit-level 0, covered and protected by the arched standard.

I would remark that the telescope or sighttube may be pivoted at its middle directly to the crown of the arched'standard; but it is preferable to have it applied thereto by means of the separate socket-piece, as described, arranged with and adapted to the'standard in manner as explained.

Besides the screws K, the instrument maybe provided with one or more adjusting-screws, N, arranged in its base in manner as represented, such being to enable the base to be brought into a horizontal plane when resting on a Surncath the telescope,such being as represented in the aforesaid patent granted to me.

At its middle-the-base A extends between two lips or standards, g, that project upward from a flat metallic bar, 0, a pivotal screw, P, being inserted in such lips and base, as represented,whereby the bar 0 is pivoted or hinged to the base A. The said bar 0 extends a suit able distance beyond the base A at each end thereof, and has in it holesfto receive screws for fastening the said bar to a common artificers level or to a beam or bar, as occasion may require. The screws N, at their lower ends, bear on the bar 0. Furthermore, the base A and the bar 0 have at the centers of their lower surfaces holes Zm,'respectively, for reception of a pivot, n, projecting upward from the center of a circular stand, R, provided with legs S S S, each of which is a screw screwed upward into the stand, these legs being at equal distances apart. Extending downward from the stand It is a centralizing-pointer, T. The periphery of the stand has marked upon it the divisions of an arc of ninety degrees ofa circle, as s-hownat U. This stand may be used with the leveling-instrument either with or without the bar 0 applied to the said instrument, the pointer serving to centralize the stand over any point in a surface on which the legs of the stand may rest, \Vith the stand not only can the instrument be used for determining angles, but it can be leveled so as to turn or traverse around in a horizontal or an inclined plane, all of which will be readily understood by artificers. The stand has at its peripherya circular flange, a2, projecting up from it, as shown, such flange being to support the bar 0 when pivoted to the stand.

' In using the centralizing-pointer it is to have its point or lower end brought directly over and upon the point constituting the vertex of an angle set ofi' or measured by the graduated stand. The pointer thus becomes a pivot or guide to keep the stand in position, while it may be revolved to bring the telescope (With the bar or standard set to the commencement of the scale) to bear upon an object the angle between which and another is to be measured or set off. The stand next being leveled and the telescope properly ranged on the object, such telescope may be turned horizontally to the angle to beset ofi' or to bear on the object whose angle with the first-named object is to be ascertained.

An artificers level constructed as described becomes a convenient, cheap, and durable article for use by masons ioiners, or machinists for leveling. It can also be used for defining inclinations or slopes.

WVhat I claim as my invention is as follows,

VIZ:

1. The combination of the stand R, provided with the circular flange, divided are, central pivot, centralizing-pointer, and adjustable legs, with the bar 0, provided with the lips g and pivotal screw P, and with the spirit-level-carrying bar A, arched standard B, telescope I, I

JOHN W. HARMOJ.

\Vitnesses:

R. H. EDDY, E. B. PRATT. 

